منابع مشابه
What story is told by oceanic tracer concentrations?
In their report "Temporal trends in deep ocean Redfield ratios" (4 Feb., p. 831), Pahlow and Riebesell suggest that the marine biota has changed in the last few decades in response to human activities. These findings challenge the steady-state paradigm of ocean biogeochemistry and might have important implications for the global carbon cycle. However, the signals that Pahlow and Riebesell analy...
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CMAJ • OCT. 20, 1998; 159 (8) 911 Medical philately, the collection and study of stamps related to medicine, poses an interesting challenge because stamps’ medical significance is not always readily apparent. As well, many of the “doctors” they honour are not doctors of medicine. It is difficult to define what medical stamps are because they can depict people with a medical or scientific backgr...
متن کاملIron metabolism in hemodialyzed patients – a story half told?
INTRODUCTION All living organisms have evolved sophisticated mechanisms to maintain appropriate iron levels in their cells and within their body. Recently our understanding of iron metabolism has dramatically increased. Overt labile plasma iron (LPI) represents a component of non-transferrin bound iron (NTBI) that is both redox active and chelatable, capable of permeating into organs and induci...
متن کاملRebuttal: When it comes to scientific inference, sometimes a cigar is just a cigar.
2012;379:1173. 26 Swanson JM. UK Biobank and selection bias. Lancet 2012; 380:110. 27 Davey Smith G, Lawlor DA, Harbord R et al. Clustered environments and randomized genes: a fundamental distinction between conventional and genetic epidemiology. PLoS Med 2007;4:e352. 28 Mayer-Schonberger V, Cukier K. Big Data. London: John Murray, 2013. 29 Mills H. Analytics: turning data into dollars. Forward...
متن کاملWhen every $P$-flat ideal is flat
In this paper, we study the class of rings in which every $P$-flat ideal is flat and which will be called $PFF$-rings. In particular, Von Neumann regular rings, hereditary rings, semi-hereditary ring, PID and arithmetical rings are examples of $PFF$-rings. In the context domain, this notion coincide with Pr"{u}fer domain. We provide necessary and sufficient conditions for...
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ژورنال
عنوان ژورنال: The Iowa Review
سال: 2004
ISSN: 0021-065X,2330-0361
DOI: 10.17077/0021-065x.5850